Tsukiko walks into a school full of boys literally designed to match her astrological type, and the show knows exactly what it's doing with that premise. Each zodiac boy gets two episodes to charm you before the next one arrives, which means you're perpetually in that early-romance glow where everything feels possible. The pacing is so compressed that it actually works, there's no time for the romance to get complicated, just enough time to let you fall for someone before moving on to the next one.

Tsukiko Yahisa enrolls at Seigetsu Academy, a formerly all-boys school that has recently gone co-ed and specializes in teaching astronomy. Because of its rural location and its specialized courses, she is the only girl ever to enroll there. Her childhood friends Kanata Nanami and Suzuya Touzuki stay close and guard her from the attention of the other students. At the academy she meets 13 very different boys, each modeled on one of the Western zodiac signs, and growing closer to them pulls her into a series of romantic entanglements. Adapted from a line of otome dating sim games by Honeybee, the ONA mixes comedy, drama, romance and slice of life.